Absolute nonsense spread to 8000 people.

Дата публикации: 09-10-2026 01:23:44

thefrogman:sirfrogsworth:Absolute nonsense spread to 8000 people. Crows are tetrachromats. They have 4 color-detecting cones instead of 3 and one of them can detect light in the UV range. Humans can see down to about 380 nanometers and crows can see down to 300. There is no way to conceptualize how they experience color. Not only do they see more wavelengths, but their 4th cone allows them to process completely new color experiences. Our eyes combine red, green, and blue in many variations. A fourth cone adds another dimension of color possibilities. Human vision compared to bird vision is a bit like dog vision compared to human vision. We can roughly simulate the color experiences of a dog, but they just do not have the biological hardware to know what our version of red is like. We are the dog when compared to birds.So, crows seeing UV doesn’t let them see secret blues, greens, and purples. Those are all colors in our visual spectrum. And crows certainly wouldn’t appear white.A quick explainer on reflected light…Non-metallic objects have two reflections. There is a surface reflection that takes on an image of the light source and maps it onto the geometry of the thing. This is called a specular reflection. When you look at a crow, you will see brighter white glossy highlights.Those highlights are just an image of the sun mapped onto the topography of a crow.And then there is a subsurface reflection. 3D artists often call this subsurface scattering because light penetrates and bounces around, causing it to be diffused. This is typically where the pigmented color comes into play. An apple is red because its subsurface reflection absorbs all other colors and yeets red wavelengths in all directions.So the shiny stuff is the specular highlights. The color is the diffuse subsurface reflection. And if the object is very matte (which just means microscopically bumpy), the two reflections sort of blend into each other and become less distinct.Crows have dark melanin, which absorbs visible light and UV. So whatever a crow’s version of black is, that is the subsurface reflection they will see.And whatever their version of white is, that is what the specular reflection will be. However, crows have UV iridescence. They have structural color in their feathers that provides some shimmery color experiences. But it’s UV. So we can’t see it. We can’t imagine it. We have no reference for what 4-cone bird vision renders in their little bird brains. It won’t be blue, purple, or green. It will be some color we haven’t even named. Blurple… or something. So, the pigment will be whatever black is.The specular highlights will be whatever white is. And the iridescence will be a shimmering blurple (depending on the angle of the light and the angle of the observing crow). The best way I can think of to kinda/sorta envision it is to show you another grackle. (Not my photo)It will have a dark base, shiny specular highlights, and some shifting colors we cannot conceive. I’m sure it is quite beautiful and it makes all the crows horny. But it will not be some albino disco bird. Some folks might be sad they can’t see UV iridescence and the color blurple, but our human visual spectrum is actually pretty great. Sometimes seeing more is not better. If we could see into the UV range, we’d be much more aware of bodily fluids. Do we want to know exactly where the dog peed on the fire hydrant? If you were in a hotel room with a big window letting sunlight in, our eyes would CSI way too much. Infrared would just be constant fart clouds. In the end, ROYGBIV is the way to go.

Основное содержимое страницы с новостью.

Absolute nonsense spread to 8000 people.

Crows are tetrachromats. They have 4 color-detecting cones instead of 3 and one of them can detect light in the UV range. Humans can see down to about 380 nanometers and crows can see down to 300.

There is no way to conceptualize how they experience color. Not only do they see more wavelengths, but their 4th cone allows them to process completely new color experiences. Our eyes combine red, green, and blue in many variations. A fourth cone adds another dimension of color possibilities.

Human vision compared to bird vision is a bit like dog vision compared to human vision.

We can roughly simulate the color experiences of a dog, but they just do not have the biological hardware to know what our version of red is like. We are the dog when compared to birds.

So, crows seeing UV doesn’t let them see secret blues, greens, and purples. Those are all colors in our visual spectrum.

And crows certainly wouldn’t appear white.

A quick explainer on reflected light…

Non-metallic objects have two reflections. There is a surface reflection that takes on an image of the light source and maps it onto the geometry of the thing. This is called a specular reflection.

When you look at a crow, you will see brighter white glossy highlights.

Those highlights are just an image of the sun mapped onto the topography of a crow.

And then there is a subsurface reflection. 3D artists often call this subsurface scattering because light penetrates and bounces around, causing it to be diffused. This is typically where the pigmented color comes into play.

An apple is red because its subsurface reflection absorbs all other colors and yeets red wavelengths in all directions.

So the shiny stuff is the specular highlights. The color is the diffuse subsurface reflection. And if the object is very matte (which just means microscopically bumpy), the two reflections sort of blend into each other and become less distinct.

Crows have dark melanin, which absorbs visible light and UV. So whatever a crow’s version of black is, that is the subsurface reflection they will see.

And whatever their version of white is, that is what the specular reflection will be.

However, crows have UV iridescence. They have structural color in their feathers that provides some shimmery color experiences.

But it’s UV.

So we can’t see it.

We can’t imagine it.

We have no reference for what 4-cone bird vision renders in their little bird brains. It won’t be blue, purple, or green. It will be some color we haven’t even named.

Blurple… or something.

So, the pigment will be whatever black is.

The specular highlights will be whatever white is.

And the iridescence will be a shimmering blurple (depending on the angle of the light and the angle of the observing crow).

The best way I can think of to kinda/sorta envision it is to show you another grackle.

(Not my photo)

It will have a dark base, shiny specular highlights, and some shifting colors we cannot conceive.

I’m sure it is quite beautiful and it makes all the crows horny. But it will not be some albino disco bird.

Some folks might be sad they can’t see UV iridescence and the color blurple, but our human visual spectrum is actually pretty great.

Sometimes seeing more is not better.

If we could see into the UV range, we’d be much more aware of bodily fluids. Do we want to know exactly where the dog peed on the fire hydrant? If you were in a hotel room with a big window letting sunlight in, our eyes would CSI way too much.

Infrared would just be constant fart clouds.

In the end, ROYGBIV is the way to go.

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Absolute nonsense spread to 8000 people.

Дата публикации: 09-10-2026 01:23:44

Основное содержимое страницы с новостью.

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